A touch display device including a substrate, a display medium layer disposed above the substrate, first side electrodes and a sensing electrode disposed above the substrate is provided. The display medium layer includes charged particles and micro-structures connected to each other. Each of the micro-structures holds a portion of the charged particles, and has a first side wall which is not parallel to the substrate. Each of the first side electrodes is disposed above the first side wall of each of the micro-structures. The micro-structures are disposed between the substrate and the first side electrodes. A touch sensing unit is composed by the sensing electrode and the first side electrodes.